On the NFS client, execute the following command and in output check, if pnfs=not configured is present.

egrep "nfs(v)?4" /proc/self/mountstats
device NFS-Server-IP:/mnt/path-shared mounted on /mnt/point with fstype nfs4 statvers=1.2
nfsv4: bm0=0xfdfbbbff,bm1=0x40f9bui3e,bm2=0x906,acl=0x3,sessions,pnfs=not configured

You can only use the ordered journaling method on a Linux Server. First check if the journal feature is enabled on ext3/ext4 filesystem with the following command:

tune2fs -l /disk-path

Check the output of the above command for has_journal which indicates the journaling is enabled on the filesystem.

Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

To disable journaling use the command:

tune2fs -O ^has_journal ext4-device-name

If you want to enable (on device without prefix or with + prefix) then run the command:

tune2fs -O has_journal ext4-device-name

tune2fs -O +has_journal ext4-device-name

Tip from ‘man tune2fs’ page: Filesystem features prefixed with a caret character (‘^’) will be cleared in the filesystem’s superblock; filesystem features without a prefix character or prefixed with a plus character (‘+’) will be added to
the filesystem.

You can use RewriteCond and RewriteRule on a webserver. The RewriteRule evaluates the HTTP method used and RewriteRule blocks the request with error 403 Forbidden.

RewriteCond %{REQUEST_METHOD} ^(PUT|DELETE|TRACE|OPTIONS|CONNECT)$ [NC]
RewriteRule .* - [F]

By default, rsync overrides old files in the destination server/folder. To resolve this use the –backup flag in rsync.

rsync -a –backup –backup-dir=”/src-old-files” /usr/src/ root@85.17.219.154:/src-backup/

The above rsync command will copy files from local server /usr/src to root@85.17.219.154:/src-backup/. If some files are overwritten in root@85.17.219.154:/src-backup/, these will be backed up in root@85.17.219.154:/src-old-files first before they are being overwritten.

• You can add the progress option with rsync command:

rsync -a --progress /media/backup-folder/
sending incremental file list
created directory backup

• or you can add the -P flag in rsync command as below:

rsync -a -P /media/backup-folder/
sending incremental file list
created directory backup

Note that the -P option includes both –partial and –progress rsync options.

To exclude a single directory with rsync use the following command

rsync -av -e --exclude='/directory-path/' ip:/destination-folder

rsync -av -e --exclude='/directory-path-1' --exclude='/directory-path-2/*' ip:/destination-folder

The following error is generated when rsync is run with the -X option (preserve extended attributes)

rsync -axHAX --delete /. /tmp/selinux/.
rsync: rsync_xal_set: lsetxattr("selinux","security.selinux") failed: Permission denied (15)
rsync error: some files/attrs were not transferred (see previous errors) (code 31) at main.c(1039)

To resolve this error, filter the ‘/selinux’ filesystem from the command. Run rsync as below;

rsync -axHAX --delete --filter="- /selinux" /. /tmp/selinux/.

It is suggested to also excluded /var/run, /var/lock, /proc and /dev from rsync command.

Cluster nodes can form membership if the value of totem token is 29000 ms. Once the totem token is set to value 30000 ms or above, the cluternodes fail to establish a connection between the nodes (inquorate).

To resolve this issue, update OS to CentOS 8.3

The command yum module list output @modulefailsafe

# yum module list --disablerepo=\*
@modulefailsafe
Name Stream Profiles Summary
389-ds 12 [e] 209 Directory Server (base)
ant 1.9 [e] common Java build tool
httpd 2.2 [e] common, devel, mini Apache HTTP Server

In the case of local repositories, Re-build repodata either with reposync --download-metadata or modifyrepo to include the modules.yaml into the repomd.xml

The issue is usually caused when the module metadata is not available. Unavailability of module metadata happens when the user removes a .repo file or disables a repository via –disablerepo / –repoid or repository is unavailable and has option skip_if_unavailable=true.